Knauf Isolator can be used in the residential or commercial sectors to provide high sound isolation and privacy in a dry wall construction.

Features and benefits:

  • This systems twin frames provide separation which, combined with high-performance Knauf Plasterboards and Knauf insulation, realise high acoustic sound reduction.
  • Vertical service runs are easily accommodated within the metal framework.
  • Suitable for impact duty requirements up to Severe Duty.

To be installed in accordance with Knauf recommendations and British standards BS 8212-1995 and BS 8000-8:1994.

Sockets and switches require either baffle box details or Knauf Putty Pads. Sacrificial wall linings should be considered where multiple penetrations occur.

General information

Uniclass 2015

Ss_25_10_30_35 Gypsum board partition systemsPrimary


K10/125 Metal stud partition system

K10/30 Metal stud

Specification data - Gypsum board partition systems

Product Reference

Isolator for Commercial Projects: Isolator ILC3/13



Stud configuration

92 mm Knauf 'I' stud, 0.55 gauge

92 mm Knauf 'I' stud, 0.7 gauge

Framing centres

300 mm

400 mm

For areas to receive a ceramic tiled finish.

600 mm


Head/ Floor channel

94 mm Knauf ‘U’ Channel

Utilising 94 mm Knauf Deep Flange 'U' Channel if deflection allowance is specified.


Knauf Nailable plugs at maximum 600 mm centres

Where alternative fixings are used to meet performance constraint confirmation is required from supplier.




Three layers of 15 mm Knauf Soundshield Plus to each side

Horizontal board joints

Knauf Flat Fixing Plate


Knauf Performance Plus Screws

To be used with Knauf Performance Plus and Knauf Soundshield Plus boards.

Knauf Screws

Perimeter Sealing

Two continuous beads of Knauf Sealant on Head/ Floor Channels

Knauf Intumescent and Acoustic Mastic


100 mm Knauf Mineral Wool (minimum 10 kg/m³)

Head condition

Structural soffit

Deflection allowance

To be determined by a structural engineer. Consult manufacturer for information.

Head track fillets

Consult manufacturer and insert requirements.

Head insulation detail


Not required


Taped and Jointed for a Seamless finish using Knauf Jointing Products

Taped and skimmed with Knauf Finishing Plaster

Knauf RMF [Ready Mixed Finishing] in accordance with General clauses

Standard product features

Fire resistance (BS 476: Parts 20 and 22 Integrity and Insulation):

120 minutes.

Acoustic rating (when tested to BS EN 10140-2:2010):

75 Rw dB.

Partition thickness:

550 mm (excluding finishes).

Maximum partition height (based on limiting deflection of L/240 at 200 Pa):

5700 mm.

Duty rating (BS 5234: Part 2 Section 1.6.2 and 1.6.3):


Product Options


- Stud configuration:

Use Knauf ‘C’ Studs at corners and abutments where required. Bracing of ‘C’ studs at maximum 1200 mm centres (if required).

Head insulation detail:

Knauf Mineral Wool Building Slab Insulation RS60 retained by Knauf 100 x 92 mm angle sections at head of partition.

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